#1D378B#1D378B

#1D378B is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.3% C 0.143 H 266.3°. Best body text is #FFFFFF at 10.65:1 contrast (WCAG AA passes).

Color values

HEX	#1D378B
RGB	rgb(29, 55, 139)
HSL	hsl(226, 65%, 33%)
HSV	hsv(226, 79%, 55%)
CMYK	cmyk(79.1%, 60.4%, 0%, 45.5%)
CIE-LAB	lab(26.32, 22.37, -49.52)
CIE-LCH	lch(26.32, 54.34, 294.31°)
OKLab	oklab(37.32% -0.0094 -0.143)
OKLCH	oklch(37.32% 0.143 266.3)
XYZ	xyz(6.5314, 4.8569, 25.0143)
Luminance	0.0486 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D378B #8B711D

analogous

#1D6E8B #1D378B #3A1D8B

triadic

#1D378B #8B1D37 #378B1D

tetradic

#1D378B #8B1D6E #8B711D #1D8B3A

square

#1D378B #8B1D6E #8B711D #1D8B3A

split-complementary

#1D378B #8B3A1D #6E8B1D

monochromatic

#080F26 #122358 #1D378B #284BBE #496BD9

Accessibility & contrast

On white

10.65

#1D378B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#1D378B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D378B

10.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D378B	#FFFFFF	#000000	##FFFFFF
##1D378B	1.00	10.65	1.97	10.65
#FFFFFF	10.65	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00448E

Deuteranopia (green-blind)

#003989

Tritanopia (blue-blind)

#004C5B

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1d378b;
/* rgb */ color: rgb(29, 55, 139);
/* oklch */ color: oklch(37.3% 0.143 266.3);

Tailwind

colors: {
  custom: {
    50: '#6c6dae',
    500: '#1d378b',
    950: '#000000',
  },
}

SCSS

$custom: #1d378b;
$custom-light: #6c6dae;
$custom-dark: #000000;

JSON

{
  "hex": "#1d378b",
  "rgb": {
    "r": 29,
    "g": 55,
    "b": 139
  },
  "hsl": {
    "h": 225.818,
    "s": 65.476,
    "l": 32.941
  },
  "oklch": {
    "l": 0.37323,
    "c": 0.14335,
    "h": 266.3
  },
  "luminance": 0.04858
}

Semantic roles & 50–950 ramp

primary

#1D378B

secondary

#BBA049

accent

#C03FE8

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1D378B

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →